package event import ( "strings" ) // State holds the current state of key/mouse events. type State struct { // Mouse buttons. Button1 bool // Left Button2 bool // Middle Button3 bool // Right // Special keys Escape bool Space bool Enter bool Shift bool Ctrl bool Alt bool Up bool Left bool Right bool Down bool // Pressed keys. keydown map[string]interface{} // Cursor position CursorX int CursorY int // Window resized WindowResized bool // Touch state Touching bool TouchNumFingers int TouchCenterX int TouchCenterY int GestureRotated float64 GesturePinched float64 } // NewState creates a new event.State. func NewState() *State { return &State{ keydown: map[string]interface{}{}, } } // SetKeyDown sets that a named key is pressed down. func (s *State) SetKeyDown(name string, down bool) { if down { s.keydown[name] = nil } else { delete(s.keydown, name) } } // KeyDown returns whether a named key is currently pressed. func (s *State) KeyDown(name string) bool { _, ok := s.keydown[name] return ok } // KeysDown returns a list of all key names currently pressed down. // Set shifted to True to return the key symbols correctly shifted // (uppercase, or symbols on number keys, etc.) func (s *State) KeysDown(shifted bool) []string { var ( result = make([]string, len(s.keydown)) i = 0 ) for key := range s.keydown { if shifted && s.Shift { if symbol, ok := shiftMap[key]; ok { result[i] = symbol } else { result[i] = strings.ToUpper(key) } } else { result[i] = key } i++ } return result } // ResetKeyDown clears all key-down states. func (s *State) ResetKeyDown() { s.keydown = map[string]interface{}{} } // shiftMap maps keys to their Shift versions. var shiftMap = map[string]string{ "`": "~", "1": "!", "2": "@", "3": "#", "4": "$", "5": "%", "6": "^", "7": "&", "8": "*", "9": "(", "0": ")", "-": "_", "=": "+", "[": "{", "]": "}", `\`: "|", ";": ":", `'`: `"`, ",": "<", ".": ">", "/": "?", }